Encyclopedia

throttling valve

throttling valve

[′thräd·əl·iŋ ‚valv]
(ordnance)
Part of a variable recoil system of a gun, it is a spring-loaded valve through which recoil oil must flow during recoil; as the gun is elevated, the spring pressure is increased by means of a control arm; the valve thus offers greater resistance to the flow of recoil oil and the length of recoil is reduced; in a similar manner, depressing the gun decreases the spring pressure of the valve, with less resistance to oil flow and hence greater length of recoil.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

throttling valve

In a piping system, an orifice designed to control the rate of flow through it.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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References in periodicals archive
After leaving the condenser the refrigerant is at medium temperature and high pressure and then it enters the throttling valve. In the throttling valve the pressure and the temperature of the refrigerant is reduced drastically and suddenly.
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The saturated liquid (7) is divided in two parts (8, 9), one part (9) is passed through throttling valve (TV1) where pressure is reduced to evaporator pressure (10) and feed to evaporator (E1), and second part (8) is pumped by pump (P1) to the HRVG of RC cycle.
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Then, there would be a final open loop closing of the throttling valve at a fixed position to dampen the impact even further.
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It replaced the throttling valves of Dolphin Cove filtration pumps with adjustable speed drives, or ASDs.
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Efficiency measures such as replacing throttling valves with speed controls can yield savings that range from 5% to 50% of the system's total energy use.
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Pump screens have a tendency to plug with felt hairs, fiber, lunch sacks, etc.; all of these act as throttling valves at the vacuum pump.
Troubleshooting paper machine vacuum systems: part I: low vacuum levels can be caused by roll problems, vacuum line disturbances, and plugged pump screens
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